Ammonia Gas Sensor (NH3 Sensor) - MQ137

I. Ammonia Gas Sensor (NH3 Sensor) MQ137 Product Description:

MQ137Gas SensorsThe gas sensing material used is tin dioxide (SnO2) with low conductivity in clean air. When ammonia gas is present in the environment, the sensor's conductivity increases with the concentration of ammonia in the air. A simple circuit can convert the change in conductivity into an output signal corresponding to the gas concentration.

The MQ137 gas sensor has high sensitivity to ammonia and is also ideal for monitoring other organic amines (such as trimethylamine, ethanolamine, etc.). This sensor can detect a variety of ammonia-containing gases and is a low-cost sensor suitable for multiple applications.

II. Ammonia Gas Sensor (NH3 Sensor) MQ137 Sensor Features:

High sensitivity to ammonia

Long life, low cost

Simple drive circuit required

III. Ammonia Gas Sensor (NH3 Sensor) MQ137 Main Applications

Household ammonia alarms

Industrial ammonia leak alarms

Portable gas detectors

IV. Ammonia Gas Sensor (NH3 Sensor) MQ137 Technical Specifications

Model			MQ137
Product Type			Semiconductor gas sensing element
Standard Package			Bakelite (black bakelite)
Detection Gas			Ammonia
Detection Concentration			5-500ppm ammonia
Standard Circuit Conditions	Loop Voltage	Vc	≤24V  DC
	Heating Voltage	VH	5.0V±0.2V ACorDC
	Load Resistance	RL	Adjustable
Gas Sensing Element Characteristics under Standard Test Conditions	Heating Resistance	RH	31Ω±3Ω (room temperature)
	Heating Power Consumption	PH	≤900mW
	Surface Resistance of Sensing Body	Rs	2KΩ-15KΩ(in 50ppm NH3)
	Sensitivity	S	Rs(in air)/Rs(50ppmNH3)≥3
	Concentration Slope	α	≤0.6(R100ppm/R50ppm NH3)
Standard Test Conditions	Temperature, Humidity		20℃±2℃；65%±5%RH
	Standard Test Circuit		Vc:5.0V±0.1V；  VH: 5.0V±0.1V
	Preheating Time		No less than 48 hours